How Bitcoin works: the blockchain explained
The 51% attack: could someone rewrite Bitcoin's history?
Bitcoin has no boss to protect its ledger. So what would it take to undo a payment that six blocks already confirmed, and what could an attacker still never do?
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Picture an attacker who pays an online shop 10 bitcoin. The shop waits for six confirmations, then sends him the goods.
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But in secret, the attacker builds his own branch. It starts from the block just before his payment. In his branch, the same 10 bitcoin go back to himself.
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